HONGKONG Telecom isn't worried about cut-price competitors like City Telecom, whose price cuts are revealed elsewhere in today's Business Post, because it will beat them on quality of service, it says. Here are two incidents from yesterday. The first call was from Simon Roberts of Discovery Bay. He rang to say he used to pay extra for the fax machine at home, having been told he had to. When he found out he didn't, he cancelled the special fax line service. He got billed anyway for fax charges on September 22. ''Of course I ignored it,'' he says. ''I never thought anything more about it until my phone was cut off.'' His wife is five months pregnant, by the way. Apparently the department that handles fax lines never told the billing people that he'd cancelled. He was told it was company policy that it was the duty of customers to notify Telecom if there was any error in the bill, and no disconnection notices were issued. Once he'd come off the roof, there was a further sting: the easy way to solve the problem was for him to pay the $277 bill, and they would refund it later. Over at a Hollywood Road trading firm, Mike Hathiramani had an interesting encounter this week. Like many others, he used to check his bill against the fax log and claim a rebate for failed fax calls. After totting up January to July, by mid-summer he was expecting to get his bill reduced by about $6,000. He was told the company had ended the policy, and his resulting letter of complaint to the Post prompted more than a dozen others. After his letter was printed, he tells us, Telecom said he wouldn't have to pay the $6,000 after all. He heard nothing more about it. But last week he was told the company had checked his line and there were no problems. He was sent a copy of the bills again ''for your earliest settlement''. When we rang Telecom they seemed unsure whether he had to pay or not. Customer services manager Aptree Kwan said there was a ''further review'' of Mike's charges. That's four changes of mind, according to our counting. Saving grace ROB Christie of Save Power was sent a letter inviting him to call at his local Zung Fu dealer and pick up a free T-shirt with a Mercedes C-class on the front. The folks at Zung Fu sure have confidence in their sales force. It's difficult to imagine someone coming home to their spouse and saying: ''I went to pick up that T-shirt and err . . . ended up buying a new Mercedes on impulse. ''Sorry honey, but at least I saved $30 by getting the free shirt.'' Beam us up YESTERDAY'S rise of 319 points in the Hang Seng index proves that old science fiction favourite of teleportation has finally become reality. Straight after lunch the Hang Seng Index moved instantly from 9,280 to 9,300 without passing through any of the points in between, according to our computer. The problem was trying to find who was buying, with most fingers pointing to the Japanese. We rang Nomura head of research Robert Rountree and asked: ''So was it your mob?'' Mr Rountree replied: ''I am not really allowed to say and I do not know. But I went down there [to the dealing floor] and everybody seemed pretty busy, I can tell you.'' Over at Baring Securities, director James Osborn said: ''I've been watching the index all day and I have got a stiff neck it's gone up so much.'' Sweet reason THE unique health warning on cans of Diet Coke bought in Thailand, missing from those in Hong Kong, says ''unsuitable for phenylketnurics''. Dennis Valdes of NutraSweet Asia faxed us the reason, and it wasn't that Thai Diet Coke is different stuff. He said a small number of people had difficulty processing an amino acid called phenylalanine, and the US Food and Drug Administration says NutraSweet products have to carry this warning. Diet Coke contains some of the stuff. The Thais have followed suit, with a rather blunter translation. In Hong Kong, there is no warning. Dennis reckons phenylalanine is pretty safe. Only ''rare individuals'' have a problem and a can of Diet Coke has 90 mg, whereas a 3 oz hamburger contains 819 mg. He'd convinced us until he got to this bit. Saying your product is 10 times safer than a hamburger is not much of a claim. Nothing gained TOP Form International, the upmarket bra and knicker company, says its new annual report has the theme ''the balanced spread of assets''. We didn't make this up, as Dave Barry would say. Our caption shows management are afraid to take their suits off in public, but like other companies they have to display their pay-cheques to the world in their annual report. They should be less bashful. Top Form had a less than spectacular year, so the directors cut their collective salary from $2.1 million to zero. Yes, zero. Bottom line READERS seem interested in ways of keeping toilets clean. Today's tip is from Rudy van der Maat of Space Frame, which had a problem with oiks scrawling on the toilet walls in its factory in Brisbane. They painted the bottom 1.5 m of all the cubicle walls with blackboard paint and provided sticks of chalk in each cubicle. ''The walls became much easier to clean daily and gradually the practice of decorating the walls ceased,'' he says. ''I guess you can't beat the old supply and demand theory.''